73 340 Compression Test interpretation help

C130 Chief said

Here's a quickie diagnosis. Do an "Italian Tune-Up" at about 25 mph, floor it until the tranny shifts into 3rd (65-80 mph) lather rinse and repeat. The first time I bet you get a pretty good cloud of smoke, and the engine will ping and rattle pretty good. The next time, the smoke and pinging should be less.

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I tried this, and it seemed to smoke less on successive acceleration cycles.

I will try the PVC valve first. I assume I can have a machine shp cut a hole in the cover for it and the grommet? Youda thunk theyda put one on to start with!

Maybe I should put on new umbrella seals as well? Can I do this with compressed air and a regular spring compressor - the common type that clamps on with a dial on the top, or whould I get a specialty tool for chagining them on engine?

Thanks for all of the help!